Oil dispenser



Oct. 22, 1968 BREsc ms 3,406,787

OIL DISPENSER Filed Dec. 12, 1966 3 SheetsSheet l Fig.1

In ven i0? Re 4 6/151! 14%,

Get. 22, 1968 R. BRESCHINSKY OIL DISPENSER Filed Dec. 12 1966 5 Sheets-Sheet 2 Inventor.-

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Oct. 22, 1968 BREScHlNSKY 3,406,787

OIL DISPENSER Filed Dec. 12, 1966 6 Sheets-Sheet 5 Fig.5

Fig. 4

In ventor:

United States Patent Ofice 3,406,787 OIL DISPENSER Ren Breschinsky, Industriestrasse, Sennestadt, Westphalia, Germany Filed Dec. 12, 1966, Ser. No. 601,127 Claims priority, application Germany, Dec. 11, 1965,

8 Claims. Cl. 184-55) ABSTRACT OF THE DISCLOSURE BACKGROUND OF THE INVENTION In pneumatic implements, such as pneumatic drills or pneumatic hammers in which a tool is reciprocated by means of compressed air acting on a piston so that cyclic pressure variations will be created in passages through which air flows to the piston, it is known to lubricate the reciprocating parts of the implement by feeding oil into the compressed air by means of which the tool is reciprocated. The present invention relates to a dispenser for dispensing oil into the air passage through which compressed air is fed to the pneumatic implement to thus lubricate the reciprocating parts of the pneumatic implement.

It is an object of the present invention to provide for an oil dispenser of the aforemntioned kind which is simple in construction and which will operate trouble-free after extended use.

It is an additional object of the present invention to provide for an oil dispenser of the aforementioned kind by means of which the oil is fed in finely divided form into the stream of compressed air passing through the air passage.

It is a further object of the present invention to provide an oil dispenser of the aforementioned kind in which the amount of lubricating oil fed into the air passage can be regulated.

SUMMARY OF THE INVENTION The dispenser for dispensing oil into an air passage through which compressed air is fed to a pneumatic implement such that cyclic pressure variations will be created in the air passage mainly comprises, according to the present invention, an oil container, passage means communicating at opposite ends thereof with the oil container and the aforementioned air passage, a valve seat formed in a portion of the passage means, and a valve body arranged with clearance in the passage means and subjected at one side thereof to the cyclically varying air pressure in the air passage to be intermittently moved thereby toward and away from the valve seat thus intermittently permitting and interrupting flow of oil from the oil container into the air passage.

Preferably, the oil dispenser includes also adjusting means cooperating with the valve body and limiting movement of the latter away from the valve seat to thereby regulate the stroke of the valve body and the amount of oil dispensed during each stroke.

The adjustable means may include an adjusting screw which is preferably provided at the outer end thereof with a circumferential scale facilitating the axial adjustment of 3,406,787 Patented Oct. 22, 1968 the screw and thereby the amount of oil fed during each stroke of the valve body into the air passage.

The various elements of the oil dispenser are preferably enclosed in a housing and this housing may be made en tirely or at least the part thereof which defines the oil reservoir in the housing, of transparent plastic material so that the amount of oil in the oil reservoir and/or the proper operation of the dispenser may be easily ascertained.

Preferably, the housing which contains all elements of the oil dispenser is constructed in such a manner that it can be easily connected to a pneumatic implement.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially sectioned side view of an oil dispenser according to the present invention;

FIG. 2 is a front view of the dispenser shown in FIG. 1;

FIG. 3 is a partially sectioned detailed view of the oil dispenser shown in FIG. 1, drawn to an enlarged scale;

FIG. 4 is a cross-sectional view of a further embodiment of an oil dispenser according to the present invention; and

FIG. 5 is an end view of the embodiment shown in FIG. 4.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings, and more specifically to FIGS. 1-3 of the same, it will be seen that the oil dispenser according to the present invention illustrated in these three figures mainly comprises a housing or hous ing means 1 preferably formed from a block of transparent material. A blind bore extending from the right side, as viewed in FIG. 1, into the block 1 forms an oil reservoir 2 in the upper part of the housing and this oil reservoir is closed at the right end of the bore by a screw plug 3, screwed at its inner end into an appropriately threaded right end of the bore forming the oil reservoir 2. A sealing ring 4 is placed between the right surface of the housing 1 and the head of the screw 3, to provide a proper seal. By removing the screw 3, the oil reservoir 2 may be filled with bubricating oil.

An air passage 5 is formed by a bore through the housing extending substantially parallel and spaced from the bore forming the oil reservoir 2. Nipples 6 and 7 of any standard construction are provided at opposite ends of the bore 5, and the nipple 6 serves for connecting a preferably flexible conduit thereto to provide communication between the air passage 5 and a source of compressed air, not illustrated in the drawing, whereas the nipple 7 serves to connect the air passage 5 to a corresponding air passage in a pneumatic implement (not shown), so that compressed air from the source of compressed air may be fed to the pneumatic implement while passing through the air passage 5 in the housing 1. The oil dispenser may be used in combination with pneumatic implements which are intermittently operated by compressed air, such as for instance pneumatic hmamers, and which have to be lubricated.

Passage means 8 communicate at opposite ends thereof with the oil reservoir 2 and the air passage 5. The axis of the passage means 8, preferably extends substantially normal to the axis to the air passage 5. The passage means 8 is formed by a stepped bore so as to form intermediate the ends thereof a valve seat 9. A valve body, which in the embodiment illustrated in FIGS. 1-3 is constituted by a piston '10, is located in the passage means 8 movable toward and away from the valve seat 9. The outer diameter of the piston 10 is smaller than the inner diameter of the portion of the passage means 8, in which the piston is located. A small diameter valve stem 11 (FIG. 3) projects coaxially with the piston 10 from the side thereof facing away from the valve seat 9. The bottom surface of the piston 10 is formed by a sealing ring 12.

The arrangement includes also preferably adjustable means cooperating with the valve body or piston 10 for limiting movement of the latter away from the valve seat 9. These means may comprise a bolt 13 of varying outer diameter having a head 14 projecting into the passage means 8 and being provided with an O-ring 15 forming a proper seal between the outer surface of the head 14 and the inner surface of the passage means 8. The inner end of the head 14 is axially spaced from the valve seat 9 so that the piston 10 may reciprocate between the valve seat and the inner end of the head 14. The upper portion of the bolt 13 is formed with an axial bore 16 into which the stem 11 extends with clearance. The middle portion of the bolt 13 which extends transversely through the passage 5 is formed with a plurality of axially spaced transverse bores 8 which provide communication between the axial bore 16 and the air passage 5. Annular rims 19 and 20 having outer substantially sharp edges are arranged to opposite sides of the bores 18. The sharp edges of the rims 19 and 20 will create turbulence in the compressed air passing through the passage 5 so that the oil emanating through the transverse bores 18 will be atomized and passed in the form of a fine mist into the compressed air passing through the air passage 5.

The axial position of the inner end of the bolt 13 may be adjusted by screw means 21 integrally formed with the bolt 13 and extending through a bore in the wall of the housing 1 which is coaxially arranged with the passage means 8. The bore is formed at the inner end with a screw thread threadingly engaged by a threaded portion 22 of the screw means. At the outer end, projecting beyond the housing 1, the screw means is formed with a knurled head 23 having a frusto-conical portion provided with a circumferential scale 24 to ascertain the angle about which the screw means 21 is turned and therewith the distance through which the inner end of the bolt is displaced in axial direction. When the screw 21 is turned in a direction in which the inner end of the bolt 13 connected thereto is moved inwardly, the stroke piston 10 can make will be reduced, to reduce thereby the amount of oil fed from the reservoir 2 into the air passage 5 during each stroke of the piston.

'While in the embodiment illustrated in FIGS. 1 and 3 the valve body is formed by a piston, FIGS. 4 and 5 illustrate an additional embodiment in which the valve body is formed by a ball 25. The ball 25 is located with clearance in a portion 31 of passage means having an inner end 29 of reduced diameter communicating with the oil reservoir 2, and forming between the portions 31 and 29 a valve seat 30. Movement of the ball 25 away from the valve seat is limited by the upper end of a hollow cylindrical member 26 the interior 27 of which commu nicates through openings 28 with the air passage 5 extending transversely through the housing 1. When the ball 25 moves away from the valve seat 30, oil from the oil reservoir 2 will flow about the ball 25 through the bore 32 in the upper end of the hollow body 26 into the interior 27 of the hollow body. The hollow body 26 forms downstream of the bore 32 an inner valve seat 34 and an additional ball 33 is arranged with clearance in the interior 27 of the hollow body movable toward and away from the valve seat 34. The stem 35 of an adjusting screw 36 extending coaxially through the interior of the hollow body 26 and closing the latter at the outer end thereof limits the movement of the additional ball 33 away from the valve seat 34. The stroke of this additional ball 33 may' beadjusted by screwing the screw 36 inwardly'o'r outwardly. When the air pressure in the air passage 5 increases the balls 25 and 33 will be moved against the respective valve seats 30 and 34, and during decrease of the air pressure the balls will move away from the valve seats so that oil from the reservoir 2 may flow about the balls into the air passage 5. By adjusting the stroke the ball 33 can make, the amount of oil can be adjusted which during each intermittent decrease and increase of the air pressure in the air passage 5 will flow into the latter.

The oil flowing from the oil reservoir 22 during use of the oil dispenser will be replaced by compressed air fiowing through the aforementioned passage means from the air passage 5 to the reservoir 2 so that no vacuum will form in the latter which would detrimentally affect the proper operation of the oil dispenser. The axis of the passage means which provides communication between the oil reservoir 2 and the air passage 5 extends substantially normal to the axis of the latter and the piston 10 in the embodiment shown in FIG. 1 as well as the balls 25 and 33 of the embodiment shown in FIG. 4 move therefore in a direction substantially normal to the axis of the air passage 5.

When flow of compressed air through the air passage 5 is discontinued, the overpressure in the reservoir 2 will press the sealing ring 12 of the piston 10 against the upper end of the bolt 13, respectively the ball 25 onto the upper end of the hollow cylindrical member 26, which forms a seat for this ball, so that flow of oil from the oil reservoir 2 into the air passage 5 is interrupted.

.Formation of the housing 1 from transparent plastic material permits to observe the level of oil in the oil reservoir 2 and proper function of the valve body.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of oil dispensers differing from the types described above.

While the invention has been illustrated and described as embodied in a dispenser for dispensing oil into an air passage through which compressed air is fed to a pneumatic inplement such as a pneumatic hammer or the like, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foreging will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims:

1. Dispenser for dispensing oil into an air passage through which compressed air is fed to a pneumatic implement such that cyclic pressure variations are created in said air passage, said dispenser comprising, in combination, an oil container; a connecting passage extending between said oil container and said air passage and being formed adjacent said oil container with a valve seat; a valve body in form of a piston arranged with clearance in said connecting passage and having a small diameter stem, projecting coaxially with said piston from one end face of the latter; a bolt sealingly extending into said connecting passage and having an inner end axially spaced from said valve seat, said bolt being formed with an axial bore into which said stem extends with clearance, and at least one transverse bore providing communication between said axial bore and said air passage so that said piston is subjected at said one end face thereof to the cyclic variations of air pressure in said air passage to be intermittently moved thereby toward and away from said valve seat, to thus intermittently permit and interrupt flow of oil from said oil container into said air passage; and means connected to said bolt, for moving the same in axial direction to adjust the position thereof relative to said valve seat.

2. A dispenser as defined in claim 1, and including sealing means extending about a portion of said bolt located in said connecting passage.

3. A dispenser as defined in claim 1, wherein said axial bore communicates through a plurality of transverse bores with said air passage, said plurality of transverse bores being located substantially in one plane and angularly displaced from each other, and including a pair of annular rims about said bolt respectively arranged to opposite sides of said transverse bores.

4. A dispenser as defined in claim 1, and including housing means formed by a block of material, said oil container and part of said air passage and said connecting passage being formed by bores in said block, the bore forming said connecting passage extending transverse to the bore forming part of said air passage between the latter and the bore forming said oil reservoir and being extended by a coaxial bore portion beyond said air passage to the outer surface of said block, said bore portion being formed with an inner screw thread, and said moving means including screw means integral with said bolt, threadingly engaged with said screw thread and extending beyond the outer surface of said block.

5. A dispenser as defined in claim 4, and including a head formed at the outer end of the screw means and provided with a circumferentially arranged scale.

6. A dispenser as defined in claim 4, wherein the bores forming said oil container and part of said air passage extend substantially parallel to each other and the bore forming said connecting passage extends substantially normal to the aforementioned bores.

7. Dispenser for dispensing oil into an air passage through which compressed air is fed to a pneumatic implement such that cyclic pressure variations are created in said air passage, said dispenser comprising, in combination, an oil container; passage means communicating at opposite ends thereof with said oil container and said air passage and having a portion forming a valve seat: a valve body in form of a ball arranged with clearance in said passage means; and means for limiting movement of said ball away from said valve seat and including a hollow cylindrical member extending into said passage means and through said air passage and having an inner end spaced from said valve seat and a plurality of openings providing communication between the interior of said hollow cylindrical member and said air passage so that said ball is subjected on one side thereof to the cyclic variations of air pressure in said air passage to be intermittently moved thereby toward and away from said valve seat to thus intermittently permit and interrupt flow of oil from said oil container into said air passage.

8. A dispenser as defined in claim 7, wherein said hollow cylindrical member is formed in the interior thereof and adjacent to its inner end with an inner valve seat, and including an additional ball located with clearance in the interior of said hollow member, downstream of the said inner valve seat and means cooperating with said additional ball for limiting movement thereof away from said inner valve seat.

References Cited UNITED STATES PATENTS 2,899,018 8/1959 Booth 18455 3,143,188 8/1964 Normandin 18455 3,297,106 1/1967 Hanson et a1. 18455 X ROBERT B. REEVES, Primary Examiner.

HADD s. LANE, Examiner. 

